What double negation does in C

Question

I had a controversy about what compilers \"think\" about this:

a = 8;
b = !!a;

So, is b == 0x01 ? Is TRUE always

Answer 1

Yes, b == 1. The result of any boolean operator is always 0 or 1. You can do better though...

I want to extract only 0x00 if (a == 0) and 0x01 if (a > 0)

b = a > 0; most accurately reflect your rule.